Locking means for shells



V. R. DESPARD.

LOCKIING MEANS FOR SHELLS.

APPLICATION FILED SEPT. 23, 1918.

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latented yeuzz, 1921. v

' UNITED STATES PATENT'DFFICE.

VICTOB'R. DESPABD, OF HIN'SDALE, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS 'IO McGILL MANUFACTURING COMPANY, OF VALPARAISO, INDIANA, A CORPORA:

TION OI INDIANA.

' LOCKING MEANS FOR SHELLS.

Specification of Letters Patent.

Original application filed. April 6, 1918, Serial No. 227,111. Divided and this application filed Septemlier 23, 1918. Serial No. 255,258.

To all whom it may concern:

Be it known that I, Vwron R. DESPARD, a citizen of the United States, residin at Hinsdale, in the county of Dupage and tate of Illinois, have invented a certain new and useful Improvement in Looking Means for Shells, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawingz, forming a part of this specification.

y invention relates to locking means for shells, that is, for locking shells and caps together so as to hold the incandescent socket in position, an object being to provide an improved and simplified device of this character in which the cap and shell are securely held together under normal conditions but may be readily separated by manipulation when desired. One of the features of my invention is an improved form of skirt on the cap and a cooperating collapsible end on the shell whereby all the parts are securely held together. In this connection I have provided a conical circularly recessed skirt on the cap and a correspondingly formed shouldered portion at the end of the shell so that the shell may be inserted telescopically into the recess of the skirt where it is acted upon by a lug on the interior of the skirt so as to lock the parts together.

The present application which is a division of my application Serial No. 227,111, filed Apr. 6, 1918, is directed more particularly to a device of the above character in which an adjustable lug is provided so that the cap and shell may be locked in any one of a number of different positions.

Referring now more particularly to several embodiments of my invention as'illustrated in the accompanying drawing in which like reference characters indicate like parts: 1

Figure 1 is a side elevation of one form of my invention showing the multiple position cap and shell assembled;

Fig. 2 shows the collapsible end of the shell;

Fig. 3 is a section along the line 3 3 of Fig. 2;

Fig. 8 is a detail view of-the nipple which is staked in the cap;

Fig. 9 is a flanged collar which passes through the lug arm and is secured to the interior of the cap by the ni ple.

F1g. 10 is a side elevation 0 another form of my invention in which the shell and cap have but a single adjustment;

Fig. -11 is a section along the line 1111 of Fig. 10;

-Fig. 12 is a section along the line 12 -12 of Fig. 11;

Fig 13 is an interior view of the single position cap;

Fig. 14 is a perspective View of the single posltion cap, and

Fig. 15 is a locking washer for the single position cap.

Referring now to the first form of my invention as shown in Figs. 1 to 9, it comprises a shell 15 having the usual key slot 16 which is preferably enlarged at 17 so that the side edges thereof may engage the outer edges of the locking lug hereinafter more fully referred to. The c0rners'18 of the slot are pressed inwardly slightly so as to properly pass the socket key. The lower end ofthe shell 15 is provided with a roll thread adapted to receive a shade holder or similar device. The upper end of the shell is provided with a conicalshouldered flange 19 the shell again expands and snaps into holding position in the cap. .When thus assembled the shoulder 23 on the,flange 19 abuts inside the inturned edge 22 of the sklrt while the edge 24 of the flange 19 abuts the shoulder 25 of the skirt 20, the shell thus being firmly held against any rocking motion. The construction as thus far described would permit of a ready separation of the cap and shell by a longitudinal pull on the parts. That is, unless something is provided to prevent a normal collapse of the shell it may -bereadily withdrawn from the cap. But,

in order to prevent such aseparation of the parts, I provide a locking lug 26 wh1ch 1s carried within the cap and acts upon the edges 17 of theke slot, this lug in the form of my invention s own in Figs. 1 to 9 bemg an adjustable lug 26 carried by a lug carrying arm or yoke 27 rotatably mounted withstaked and pressed into the serrations as shown in Fig. 6. Thus, the nipple and hub 30 are locked in the cap against rotation but the lug carrying arm 27 is free to be rotated within the cap, the lug 26 being preferably a pair of projecting elements adapted to snap into the perforation 34 in the skirt 20 so that the locking lug may be circumferentially adjusted into any one of a plu-' rality of positions. By means of this adjustment the shell and cap may be posivtioned'i'n any one of many relative adjust ments. In order to rotate the lug carrying arm into the-desired position a screw driver or similar tool is inserted at the point 35 (Fig. 6) between the lug and capand the lug pushed away from the cap so as to be clear of the perforations 34, 'at which time the lug may be rotated into the desired position and permitted to snap back into the proper perforations. An insulated lining 36 is provided in the cap being preferably theusual fiber lining which in the'present case is snapped into the position back of the lugs 37, 38 which are pressed out by the wall of the lug carrying arm. Thus the fiber lining is maintained in position and rotated with the lug carrying arm-but maintains the cap suitably insulated from the socket.

In assembling the cap and shell of the form shown in Figs. 1 to 9, the edge 24 of the colla sible end of .the shell is simply placed insi e the open end of the cap skirt 20, the slot 16 being first placed opposite the locking lug 26. The cap and shell are now telescopicall pressed together, the shell collapsing, an as the shoulder 23 on the conthe edges 17 of the slotregister with the lug 26, at which time the shell fully expands into locking position. It is thus held against rotary adjustment and because of the cooperation between the locking lug 26 and the edges 17 of the slot the shell and cap cannot be separated by a direct longitudinal pull on account of the lug preventing a collapse of the shell. In order to separate the parts the shell is first collapsed by pressing at either of the sldes 39 until the corresponding edge 17 is clear of the lug 26, after which a slight rotary adjustment is given to the shell so that the inwardly pressed side of the slot rests against the inner face of the lug 26. The shell is thus partly collapsed and may be separated from the cap by a direct longitudinal pull.

Figs. 10 to 15.

Referring now to the form of my inveni.

tion asshown in Figs. 10 to 15, it differs from the form already described in that the cap and shell have but one position of assembly. That is, in the present form I do not provide an adjustable locking lug but simply depress portions of the metal at 40 and 41 of the cap 44 (Fig. 14), thesdsu i pressions' acting the same as the lug 26 in that they coiiperate with the edges of the v slot inthe shell to prevent its collapse.- In

this form of my invention the hub, 29 on the nipple 28 is inserted through the central opening in the cap and. through a washer 42 (Fig. 15), being then staked so that the nipple is locked against rotation in the cap.

In order to hold the insulating lining 36 in the single position cap 44, a pair of ears 45, 46 (Fig. 11) are pressed inwardly from the cap so as to hold the lining in place.

In this form of my invention, that is as shown in Figs. 10 to 15 the same shell 15 I i may be used as in the first form described, the conical band on this shell and the recessed skirt 20 on .thecap 44 bein the same shape in both forms. In' asse'm ling and separating the parts the operation is the same as described in connection with the first form of my invention.

vention 'I have" shown several preferred --12 5 For the purpose of illustrating my informs but I understand that changes and modifications will readily occur to those skilled in the art and therefore I do not desire'to be limited to the exact forms army invention as shown and described, but aim to cover all that comes within the spirit and scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is: I

1. A device of the character described comprising a cap having a conically recessed skirt, a shell having a' slotted collapsible end adapted to be telescopically inserted into the recess of the skirt, and an inwardly rojectingcircularly adjustable lug carr1e by.

to prevent separation of the cap and shell,-

and a lug carryin arm rotatably and permanentlyvmou'nte' betweenthe nipple and the cap.

3. A device of the character described comprising a cap' having a recessed skirt, a

comprising a cap havin I. larly recessed skirtra col apsible shell havshell havin a colla sible conical end adapted to be te escopica y inserted into the recess of the skirt and a circularly adjustable lug carried by the cap,for engagement with a slot -in the shell to prevent separation of the cap and shell.

4. A device of the character described comprising a ca having a conical circularlyrecessed skirt, a shellhaving a telesco ic .end provided with means to engage wit in the recess. of the cap, and a circularly adjustable lug carried by the cap for engagement with a slot in the shell to prevent separation of the ca and shell.

5. A device of the c aracter described a conical circuing a telescopic end conforming to the re- I cess of the skirt and adapted to look therein, and a circularly adjustable lug carried y -b the cap for engagement with a s t in the -s ell to prevent separationof the cap and shell;

e. A device of the character described comprising a cap having a conical skirt with 1 turned-in edge,

shouldered conical bandcoii'forming "to the conical skirt and adapted tolock therein, and a circularly adjustable lug' carried by the cap for engagement with a slot in the shell.

a telescopicshell having a 7. A device of the character described comprising a cap having a conical circularly recessed skirt, and a collapsible shell having a telescopic end conforming to the recess of the skirt and adapted to lock therein and circularly adjustable means adapted to be placed at points around the cap to prevent relative longitudinal and rotary movement of the cap and shell.

8. device of, the character described comprising a cap having a conical circularly recessed sklrt, and 'a collapsible shell having a telescopic end conforming to the recess of the skirt and adapted to look therein and a circularly projecting means adapted to'be placed at points around the cap to prevent relative longitudinal and rotary movement of the cap and shell.

9. A device of the character described comprising a cap having a conically recessed skirt,'a shell having a collapsible end adapt ed ,to be telescopically inserted into the recess of the skirt, and a circularly adjustable lug cooperative with the shell to prevent cpllllzipse and relative rotation of the cap and s e 10.A device of the character described comprising a cap having a conically recessed skirt, a shell having a collapsible end adapt- .ed to be telescopically inserted into the recess of thes kirt, and a circularly adjustable lug cooperative with the shell to prevent collapse and telescopic separation of the cap and shell.

11. A device of. the character described comprising a cap having a conically recessed skirt, a shell having a collapsible end adapted to be telescopically inserted into the recess of the skirt, and a circularly adjustable lu coeperative with the shell to prevent co lapse and relative rotation of the cap and shell and telescopic separation thereof.

12. A- device of the character described comprising a cap having a conically recessed skirt,'a shell having a collapsible end adapted to be telescopically inserted into the recessof theskirt, an arm rotatably carried by the cap, a lug carried by the arm coeperative with the shell to prevent relative movement of the cap and shell, and means movable withthe arm for engagement with circumferentially disposed perforations in the cap 'to hold the lug in a predetermined position on the cap.

In witness whereof,- I hereunto subscribe my name this 7th day of September, A. D.,

1918. shell to prevent separation of the-cap and VICTOR R. DESPARD. 

